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FC_vertical_channel

 

 

The procedure FC_vertical_channel(Fluid$, T_s, T_infinity, P, L, S : h, Nusselt, Ra) returns the heat transfer coefficient, Nusselt number and Rayleigh number for an vertical open channel of length L and spacing S.  The units of the inputs and outputs depend on the unit settings in EES.  The magnitude of gravity is assumed to be 9.807 [m/s^2]. 

 

Inputs:

Fluid$ - string name of any fluid in the EES database. The fluid can be an ideal gas or a real fluid

T_s - surface temperature of the plate in [C], [K], [F], or [R]

T_infinity - bulk temperature of the fluid in [C], [K], [F], or [R]

P -  ambient pressure in [Pa], [kPa], [bar], [MPa], [atm], or [psia]

L - length of the channel [m] or [ft]

S - spacing of the channel [m] or [ft]

 

Outputs:

h -  heat transfer coefficient in [W/m^2-K] or [Btu/hr-ft^2-R]

Nusselt - Nusselt number [-]

Ra - Rayleigh number [-]

 

Notes:

The procedure FC_vertical_channel is primarily responsible for determining the fluid properties, and calculating the Rayleigh number. The non-dimensional procedure FC_Vertical_Channel_ND is called to calculate the Nusselt number. FC_vertical_channel, in turn, uses the Nusselt number to calculate the coefficient of heat transfer in the manner described in section 6.2.5 of Nellis and Klein.

 

Example:  

$UnitSystem SI deg K J Pa

P=101.3E3 [Pa]  

T_s=315 [K]

T_infinity=300 [K]

S=0.09 [m]

L=3 [m]

Fluid$='air'

Call FC_vertical_channel(Fluid$, T_s, T_infinity, P, L, S : h, Nusselt, Ra) 

 

{Solution:  h=2.256 [W/m^2-K]}

 

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